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Holographic correction and phasing of large sparse-array telescopes

Geoff Andersen

Geoff Andersen

The author is with the Department of Physics, Laser and Optics Research Center, Suite 2A31, 2354 Fairchild Drive, U.S. Air Force Academy, Colorado 80840. His e-mail address is geoff.andersen@usafa.af.mil.

Abstract

I have constructed a 13m-diameter telescope using separate, low-quality spherical primary mirror segments. A single hologram of the mirrors is used to correct the random surface distortions as well as spherical aberration, while simultaneously phasing the individual apertures together. I present experimental results of the removal of an error of thousands of waves to produce a diffraction-limited instrument operating over a narrow bandwidth. This technique promises to have many benefits in future space-based telescopes for imaging, lidar, and optical communications.

References

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